The MCB API uses standard HTTP response codes. Any 2xx response is successful. A 4xx means that there was an error with the data provided (like an invalid routing number). These errors can sometimes be handled programmatically by your application when we provide an error reason. A 5xx error means we encountered an error in our software, which will work to fix immediately.
A table of status codes and their meanings can be found below.
| Status Code | Description |
|---|
| 200 OK | The request succeeded. |
| 201 Created | The request succeeded and the new resource was created. |
| Status Code | Description |
|---|
| 400 Bad Request | Data was invalid or missing required parameters. |
| 401 Unauthorized | The API key was invalid. |
| 403 Forbidden | The account does not have access to the requested resource. |
| 404 Not Found | The resource that was requested could not be found. |
| Status Code | Description |
|---|
| 500 Internal Server Error | Our server encountered an error while processing your request. We will be notified and work on a fix immediately. |
| 502 Bad Gateway | Our server encountered an error while processing your request. We will be notified and work on a fix immediately. |
| 503 Service Unavailable | Our server encountered an error while processing your request. We will be notified and work on a fix immediately. |
| 504 Gateway Timeout | Our server encountered an error while processing your request. We will be notified and work on a fix immediately. |
A list of common error codes within the MCB API can be found below
